On Mon, Aug 15, 2011 at 10:19 AM, Electron wrote: > > Thanks a lot.. but the input is not DC coupled, I think I could cope > with it but just to make sure I'd prefer a DC coupled version, if anyone > has this. Moreover, 80W ain't just enough for my application. :( > > The LM4780 can do 120W bridged. Being essentially a very high power opamp, it can be DC coupled. Bridged (if you don't know) means that there are TWO driven outputs that operate 180 degrees out of phase, rather than the more typical single output. This isn't always acceptable, but I don't know what you're driving. Since you're only needed 0-700Hz, you can probably manage to follow it with biased emitter followers without too much trouble to get the desired power level. Alternately you could probably find a class-D chip that does what you want at 80% or better efficiency. Somewhat related: I'm designing a board with 3 x LM4780 chips + switching power supplies. It's not ready yet, but I might offer it to other hobbyists if people are interested. - Martin K --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .